import axios from "axios";
import {
    ElNotification,
    ElMessageBox,
    ElMessage,
    ElLoading,
} from "element-plus";
import { getToken } from "@/utils/auth";
import errorCode from "@/utils/errorCode";
import { tansParams, blobValidate } from "@/utils/ruoyi";
import cache from "@/plugins/cache";
import { saveAs } from "file-saver";
import useUserStore from "@/store/modules/user";

let downloadLoadingInstance;
export let isRelogin = { show: false };

axios.defaults.headers["Content-Type"] = "application/json;charset=utf-8";
const service = axios.create({
    baseURL: import.meta.env.VITE_APP_BASE_API,
    timeout: 10000,
});

// 请求拦截器（核心修改部分）
service.interceptors.request.use(
    (config) => {
        const isToken = (config.headers || {}).isToken === false;
        const isRepeatSubmit = (config.headers || {}).repeatSubmit === false;

        if (getToken() && !isToken) {
            config.headers["Authorization"] = "Bearer " + getToken(); // 保留原有Token配置
        }

        // 🔴 核心修改：判断是否为FormData上传请求
        if (!(config.data instanceof FormData)) {
            // 非FormData请求：保留原有逻辑（JSON头 + get参数处理）
            config.headers["Content-Type"] = "application/json;charset=utf-8";
            if (config.method === "get" && config.params) {
                let url = config.url + "?" + tansParams(config.params);
                url = url.slice(0, -1);
                config.params = {};
                config.url = url;
            }
        } else {
            // FormData请求：删除JSON头，让Axios自动处理multipart/form-data
            delete config.headers["Content-Type"];
        }

        // 防重复提交逻辑：只对非FormData请求生效（避免文件上传误判）
        if (!isRepeatSubmit && ['post', 'put'].includes(config.method) && !(config.data instanceof FormData)) {
            const requestObj = {
                url: config.url,
                data: typeof config.data === "object" ? JSON.stringify(config.data) : config.data,
                time: new Date().getTime(),
            };
            const requestSize = Object.keys(JSON.stringify(requestObj)).length;
            const limitSize = 5 * 1024 * 1024;
            if (requestSize >= limitSize) {
                console.warn(`[${config.url}]: 请求数据超出5M，跳过防重复提交`);
                return config;
            }
            const sessionObj = cache.session.getJSON("sessionObj");
            if (!sessionObj) {
                cache.session.setJSON("sessionObj", requestObj);
            } else {
                const { url: s_url, data: s_data, time: s_time } = sessionObj;
                if (s_data === requestObj.data && requestObj.time - s_time < 1000 && s_url === requestObj.url) {
                    const message = "数据正在处理，请勿重复提交";
                    console.warn(`[${s_url}]: ${message}`);
                    return Promise.reject(new Error(message));
                } else {
                    cache.session.setJSON("sessionObj", requestObj);
                }
            }
        }

        return config;
    },
    (error) => {
        console.log(error);
        return Promise.reject(error);
    }
);

// 响应拦截器（无需修改，保留原样）
service.interceptors.response.use(
    (res) => {
        const code = res.data.code || 200;
        const msg = errorCode[code] || res.data.msg || errorCode["default"];
        if (["blob", "arraybuffer"].includes(res.request.responseType)) {
            return res.data;
        }
        if (code === 401) {
            if (!isRelogin.show) {
                isRelogin.show = true;
                ElMessageBox.confirm(
                    "登录状态已过期，您可以继续留在该页面，或者重新登录",
                    "系统提示",
                    { confirmButtonText: "重新登录", cancelButtonText: "取消", type: "warning" }
                ).then(() => {
                    isRelogin.show = false;
                    useUserStore().logOut().then(() => {
                        location.href = import.meta.env.VITE_HOME_PATH;
                    });
                }).catch(() => {
                    isRelogin.show = false;
                });
            }
            return Promise.reject("会话过期，请重新登录");
        } else if (code === 500) {
            ElMessage({ message: msg, type: "error" });
            return Promise.reject(new Error(msg));
        } else if (code !== 200) {
            ElNotification.error({ title: msg });
            return Promise.reject("error");
        } else {
            return Promise.resolve(res.data);
        }
    },
    (error) => {
        console.log("err" + error);
        let { message } = error;
        if (message === "Network Error") message = "后端接口连接异常";
        else if (message.includes("timeout")) message = "系统接口请求超时";
        else if (message.includes("Request failed with status code")) message = `系统接口${message.substr(-3)}异常`;
        ElMessage({ message: message, type: "error", duration: 5000 });
        return Promise.reject(error);
    }
);

// 通用下载方法（无需修改，保留原样）
export function download(url, params, filename, config) {
    downloadLoadingInstance = ElLoading.service({
        text: "正在下载数据，请稍候",
        background: "rgba(0, 0, 0, 0.7)",
    });
    return service
        .post(url, params, {
            transformRequest: [(params) => tansParams(params)],
            headers: { "Content-Type": "application/x-www-form-urlencoded" },
            responseType: "blob",
            ...config,
        })
        .then(async (data) => {
            const isBlob = blobValidate(data);
            if (isBlob) {
                saveAs(new Blob([data]), filename);
            } else {
                const resText = await data.text();
                const rspObj = JSON.parse(resText);
                const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode["default"];
                ElMessage.error(errMsg);
            }
            downloadLoadingInstance.close();
        })
        .catch((r) => {
            console.error(r);
            ElMessage.error("下载文件出现错误，请联系管理员！");
            downloadLoadingInstance.close();
        });
}

export default service;